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US5755135A - Process for pressing a scanning device against a fiber sliver in a sliver guide and device for its production - Google Patents

Process for pressing a scanning device against a fiber sliver in a sliver guide and device for its production Download PDF

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Publication number
US5755135A
US5755135A US08/441,481 US44148195A US5755135A US 5755135 A US5755135 A US 5755135A US 44148195 A US44148195 A US 44148195A US 5755135 A US5755135 A US 5755135A
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United States
Prior art keywords
pressure
scanning element
scanning
fiber sliver
adjusting
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
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US08/441,481
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English (en)
Inventor
Michael Maria Strobel
Gerd Munnekehoff
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Rieter Ingolstadt GmbH
Original Assignee
Rieter Ingolstadt Spinnereimaschinenbau AG
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Assigned to RIETER INGOLSTADT reassignment RIETER INGOLSTADT ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MUNNEKEHOFF, GERD, STROBEL, MICHAEL-MARIA
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K26/00—Machines adapted to function as torque motors, i.e. to exert a torque when stalled
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01G—PRELIMINARY TREATMENT OF FIBRES, e.g. FOR SPINNING
    • D01G23/00—Feeding fibres to machines; Conveying fibres between machines
    • D01G23/06—Arrangements in which a machine or apparatus is regulated in response to changes in the volume or weight of fibres fed, e.g. piano motions
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01G—PRELIMINARY TREATMENT OF FIBRES, e.g. FOR SPINNING
    • D01G31/00—Warning or safety devices, e.g. automatic fault detectors, stop motions
    • D01G31/006—On-line measurement and recording of process and product parameters
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H13/00—Other common constructional features, details or accessories
    • D01H13/14—Warning or safety devices, e.g. automatic fault detectors, stop motions ; Monitoring the entanglement of slivers in drafting arrangements
    • D01H13/22—Warning or safety devices, e.g. automatic fault detectors, stop motions ; Monitoring the entanglement of slivers in drafting arrangements responsive to presence of irregularities in running material
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H5/00—Drafting machines or arrangements ; Threading of roving into drafting machine
    • D01H5/18—Drafting machines or arrangements without fallers or like pinned bars
    • D01H5/32—Regulating or varying draft
    • D01H5/38—Regulating or varying draft in response to irregularities in material ; Measuring irregularities

Definitions

  • the instant invention relates to the process of pressing a scanning device against a fiber sliver in a sliver guide such as is used to measure the thickness of fiber slivers on a textile machine.
  • a textile machine may be a carder, a draw frame, a flyer or a spinning machine.
  • the pressing of the scanning device is important for the constitution of a correct measuring signal indicating the thickness of the fiber sliver.
  • the measuring signal indicating the thickness is important to control other processes on the textile machine.
  • the fiber sliver is taken over a sliver guide which is fixedly installed.
  • a sliver guide may be a scanning roller fixed by its rotational axle, a rod, a sliver guiding channel or a sliver funnel.
  • the fiber sliver has contact with the sliver guide and is guided through same.
  • a scanning device is pressed on the fiber sliver being guided in the sliver guide. The pressure is effected by a spring which is under tension and is connected to the scanning device.
  • the scanning device is mounted movably, i.e. the scanning device moves at a distance from the sliver guide that is a function of the thickness of the conveyed fiber sliver.
  • the scanning device can execute a swivelling or a lifting movement in this process.
  • the scanning device is assigned to a signal converter which detects the movement of the scanning device and converts them into an electric measuring signal.
  • the scanning device may be a movable scanning roller for example.
  • the movable scanning roller is pressed on the fixed scanning roller.
  • the movable scanning roller can be mounted on a swivel arm or a lifting arm.
  • a spring attaches at the swivel arm or at the lifting arm and makes the pressure possible.
  • a scanning device must also be understood to be a scanning element having schematically the form of a finger. This scanning element extends towards the sliver guide in the direction of conveying. The part of the scanning element touching the fiber sliver is made in the form of a gliding surface.
  • the scanning device is movable vertically and at a right angle in relation to the direction of movement of the fiber sliver. Since the scanning device is made in the form of a lever arm, it is pressed by means of a spring in the direction of a fixed gliding surface of a sliver guiding channel or of a sliver funnel.
  • the sliver guiding channel or sliver funnel are sliver guides. Through the movement of the scanning device the thickness of the fiber sliver is ascertained.
  • a connected signal converter converts the magnitude of the movement into an equivalent electrical signal.
  • the fiber sliver is understood to be a fiber fleece, a fiber sliver made up of several doubled bands, or a drafted fiber sliver.
  • the design, utilization and operation of such a pair of scanning rollers is described in detail in the instruction manual for draw frame RSB 851 (4135), SB 851 (4131) of the RIETER Spinning Systems of August 1990. Under section 4.5.1. the adjustment of the scanning roller load is described for a scanning roller installed before the entrance to a set of drawing equipment.
  • the fixed scanning roller is mounted rotatably and has a radial groove on the circumference. The fiber sliver to be measured is conveyed in this groove.
  • the movable scanning roller is mounted by its rotational axle in a swivel arm, whereby the swivel arm can swivel around its rotational axis.
  • the swivel arm swivels in accordance with an arc of circle.
  • the movable scanning roller has a ring, radially on the circumference. Since the movable scanning roller is installed in a swivel arm, the movable scanning roller is pressed upon the fixed scanning roller by means of a spring which attaches at the swivel arm. The ring of the movable scanning roller presses into the groove of the fixed scanning roller and presses the fiber sliver to be measured as a result of the spring load.
  • the pair of scanning rollers is driven by a drive by means of force transmission means. The two scanning rollers rotate synchronously towards each other.
  • the fiber sliver is conveyed through the pair of scanning rollers and is transferred to the intake roller pair of the draw frame.
  • Scanning roller pairs in which the movable scanning roller executes a lifting movement relative to the fixed scanning roller are also known.
  • the movable scanning roller is pressed against a fixed roller.
  • the statements which follow concerning a pair of scanning rollers also apply for this form of design.
  • the axial distance between the axis of the fixed scanning roller and the axis of the movable scanning roller changes with the thickness of the fiber sliver. Due to the fluctuations in thickness of the fiber sliver, the corresponding fluctuating movements of the movable scanning roller are converted by a signal converter into an electrical signal. This electrical signal is transmitted to an electronic system which controls drafting of the fiber sliver in the drafting equipment.
  • the extent of the required pressure force for the movable scanning roller which is realized by a tension spring, depends on the fiber material processed and on the intake speed.
  • To set the desired pressure force clips at different distances on the spring are used, so that each clip can be hooked in a different position into the swivel arm.
  • the different clips represent different pressures. This change-over requires an assembly effort, whereby the draw frame must be stopped. It is also a disadvantage that the pressure can be adjusted only in steps, corresponding to the existing clips of the spring.
  • the spring is an adjusting element which is adjusted only manually. Intermediate values cannot be set.
  • a sliver guide with scanning device can also be used downstream from the drafting equipment.
  • the above-mentioned disadvantages apply equally. According to the operating manual mentioned above, this applies to the draw-off rollers (section 4.4.3, page 28 and section A4, page 86 ff). These draw-off rollers are used to measure the thickness of the fiber sliver after the drafting equipment. These draw-off rollers function similarly to the described pair of scanning rollers. The draw-off rollers supply a measuring signal to a sliver monitor which monitors the adherence to the sliver number.
  • the pressure force of the movable scanning elements is kept substantially constant over the entire measuring range of the scanning element by means of the adjusting element.
  • the adjusting element may be constituted by a cylinder chamber with piston of such dimension that it acts as a pneumatic or hydraulic volume storage.
  • a pressure is set in the volume storage which acts via the connection between piston and scanning device, the pressure representing the desired pressure force applied to the movable scanning device, under deduction of appropriate resistance forces along this connection.
  • the volume of the volume storage is sized so that the movements transmitted from the scanning device to the piston result merely in insignificant pressure changes in the volume storage. Due to the fact that insignificant pressure changes occur, it is possible to keep the pressure in the volume storage and thereby the pressure force against the movable scanning element at a substantially constant value over the entire measuring range.
  • the volume storage may be made advantageously in the form of a cylinder chamber with pressure compensating cylinder.
  • the pressure equalization cylinder may also be made in the form of a defined length of hose with stretchable sides.
  • the pressure equalization cylinder may also have a connection to a pressure generator.
  • the pressure set and held in the volume storage is transmitted at the piston by means of force transmission devices (e.g. rod) to the scanning element. It must be taken into consideration here that the force with which the piston is pre-stressed unilaterally must be overcome.
  • the pressure set and held in the volume storage is an equivalent of the pressure force of the movable scanning roller.
  • the volume storage i.e. the cylinder chamber and the pressure equalization cylinder
  • the pressure reduction valve makes it possible for the desired value of the pressure in the volume storage, and thereby in the end the pressure force of the movable scanning roller, to be adjusted continuously.
  • the connection of an adjustable pressure generator to the input of the pressure reduction valve sets the pressure in the volume storage. When the pre-set desired value is exceeded, the pressure reduction valve automatically deaerates the overpressure until the desired value is again reached. It is possible to use the adjustable pressure generator to control its own functioning. When the desired value is reached at the pressure reduction valve, the pressure generator can be stopped, so that the input pressure achieved at the pressure reduction valve is maintained.
  • values of the pressure force can be changed and adjusted continuously. This is especially advantageous when new values of the pressure force must be set as batches are changed, due to changing delivery speed or different fiber material.
  • the pressure of the volume storage can be reduced to such an extent that the piston is switched over from a pressure movement to a traction movement by the unilateral pre-stress of a compression spring.
  • the traction force at the piston exerted upon the movable scanning element due to the unilateral pre-stress of the compression spring takes the scanning element from an operating position into an opening position.
  • This taking of the scanning element into an opening position helps the operator, especially when batches are changed, to insert a new fiber sliver between the scanning element and the sliver guide.
  • a switch-over to pressure force is effected automatically by increasing the pressure in the volume storage, so that the scanning element is also brought back from its opening position into its operating position.
  • the input of the pressure reduction valve must be connected to a check valve.
  • the adjusting element can be controlled.
  • a pressure sensor which ascertains the current pressure and transmits it to controls is installed in the volume storage of the adjusting element.
  • a control valve is controlled as a function of a desired pressure value which is entered in the control program.
  • This control valve is connected to a pressure generator. In case of unwanted pressure increase in the adjusting element, this is recognized via the sensor and announced to the controls.
  • the controls control the control valve in outflow direction and closes again when the desired value has been reached. If negative pressure is present in the adjusting element, the sensor signals this to the controls and the controls switch the control valve to allow passage for the generation of pressure while actuating the pressure generator at the same time.
  • the controls close the control valve so that the pressure is maintained in the setting element and the pressure generator is stopped.
  • the program for such a control it is possible to make a selection among a plurality of desired values, whereby the selection can be made in connection with a command input from an operator level by the machine operating personnel.
  • the controls then automatically adjusts the desired pressure in the adjusting element as described earlier. As discussed earlier, this pressure corresponds to the desired contact pressure against the scanning element, under deduction of the unilateral pre-stress force of the piston.
  • the scanning element can be brought automatically by means of this control from an operating position into an opening position.
  • the adjusting element is constituted by an electrical cyclic magnet.
  • a gear is integrated on a cyclic magnet.
  • the output of the gear is connected directly or via force transmission means to the scanning element.
  • the cyclic magnet is used to provide a constant torque at very low rotational speed, or in a stopped state. This corresponds to its operating curve. It is thus possible to produce a constant torque for the entire measuring range of the scanning element ensuring a nearly constant contact pressure of the scanning element.
  • This adjusting element would also be controllable. By changing the phase control in supplying voltage to the cyclic magnet, its rotational speed and thereby its torque can be adjusted to a desired value. This is the procedure when batches are changed. The direction of rotation can also be changed. This is useful when the movable scanning element would have to be brought away from the sliver guide into an opening position.
  • FIG. 1 shows points of utilization of a pair of scanning rollers on a conventional draw frame
  • FIG. 2 shows the state of the art for the production of a contact pressure on the scanning roller pair
  • FIG. 2a shows the state of the art for the production of a contact pressure on the scanning element of a sliver funnel
  • FIG. 3 shows an adjusting element in the form of a volume storage designed with a cylinder chamber
  • FIG. 4 shows an adjusting element in the form of a volume storage designed with cylinder chamber and pressure equalization cylinder
  • FIG. 5 shows an adjusting element in the form of a volume storage according to FIG. 4, with pressure reduction valve
  • FIG. 6 shows an adjusting element in the form of a volume storage with pressure reduction valve and check valve
  • FIG. 7 shows a controllable adjusting element
  • FIG. 7a shows a control valve in the form of a 3-way valve
  • FIG. 8 shows an adjusting element in form of a cyclic magnet.
  • FIG. 1 schematically shows a draw-frame of the textile industry.
  • the fiber slivers 1 drawn from cans are fed via an intake table 4 to a sliver funnel 2.
  • This sliver funnel 2 doubles the fiber slivers into a fiber sliver 5.
  • the fiber sliver 5 appearing at the opening of the sliver funnel 2 runs through a pair of scanning rollers 3,3'.
  • This pair of scanning rollers 3,3' measures the thickness of the fiber sliver and, in association with a signal converter, produces a measuring signal indicating the sliver thickness.
  • This measuring signal is made available to a regulating device in order to control the drafting of the fiber sliver 5 in the drafting equipment 7.
  • This measuring signal 6 can, in addition, be transmitted also to additional devices of the signal processing system, for example serving to improve the drafting control.
  • the fiber sliver 5 is transferred by the pair of scanning rollers 3,3' to the pair of intake rollers 8,8' of a drafting equipment 7.
  • the drafting equipment 7 is furthermore provided with a pair of central rollers 9,9' and with a pair of delivery rollers 10,10'.
  • the fiber sliver 5 is fed by the pair of delivery rollers 10,10' to a depositing device 11.
  • This depositing device 11 contains known operating elements such as a fleece funnel, a sliver channel, a sliver funnel, and a pair of calendar rollers 300,300'. In the depositing device 11, the fiber sliver 5 runs through these operating elements which are not shown and is finally deposited by means of a rotary plate 12 in a can 13.
  • the pair of calendar rollers 300,300' has the task to measure the thickness of the fiber sliver at the output of the drafting equipment.
  • the measuring function of the pair of calendar rollers 300,300' is analogous to that of the pair of scanning rollers 3,3'.
  • the pair of calendar rollers 300,300' supplies a measuring signal 600 which may be delivered to a sliver monitor, for example.
  • the sliver monitor may monitor the observance of the sliver number, for example.
  • FIG. 2 shows other details of the scanning roller pair as they are known in the state of the art.
  • the pair of scanning rollers has a scanning roller 28 which is mounted rotatably on the rotation axle 14.
  • the rotation axle 14 is fixed.
  • the fixed scanning roller is a sliver guide.
  • the counter-piece is the scanning roller 28'.
  • the movable scanning roller 28' is a scanning element.
  • the scanning roller 28' is mounted rotatably around rotation axle 15.
  • the rotation axle 15 is located in a swivel arm 17.
  • the swivel arm carries out the function of a movement device.
  • the swivel arm 17 can be swivelled around the rotation axle 16. This mechanical arrangement similarly applies to the pair of calendar rollers 300,300'.
  • An elbow arm 18 is mounted on the swivel arm 17 and supports a metallic target 19. Across from the target 19, a sensor 20 is installed in a fixed position and operates without contact.
  • This sensor 20 has a signal circuit going to controls, which may be the controls of the drafting equipment or another signal evaluation for improvement of control.
  • the fiber sliver 29 is clampingly held between the pair of scanning rollers 28, 28'.
  • the scanning roller 28 is provided with a groove N in which the fiber sliver is guided and the scanning roller 28' is provided with a ring R which holds the fiber sliver 29 in the groove N. This geometry is advantageous for sliver guidance, but not necessary for the function of the invention.
  • the ring R and the groove N can be omitted in the pair of calendar rollers 300,300'.
  • a spring 22 is engaged at the end of the swivel arm 17 at the end of the swivel arm 17 at the end of the swivel arm 17 at the end of the swivel arm 17 at the end of the swivel arm 17 at the end of the swivel arm 17 at the end of the swivel arm 17 is a bore 23 into which a spring 22 is engaged.
  • This spring 22 is hooked at its spring end, made in the form of a bracket 26, in a fixed hook 27.
  • the spring 22 is thus under tension and presses the scanning roller 28' against the fixed scanning roller 28, i.e. the ring R presses the fiber sliver into the groove N. Thick spots or thin spots in the fiber sliver 29 result in a swivelling motion of the swivel arm 17 and thereby to a swivelling motion of the scanning roller 28
  • the measuring of the fiber sliver thickness is not only known to be effected by means of pairs of scanning rollers. Measuring the fiber sliver thickness by means of a sliver funnel and a scanning element is also known. In this sense the sliver funnel could contain a scanning element and the pair of scanning rollers 3,3' as a measuring element could be omitted. Further details are explained in FIG. 2a.
  • FIG. 2a shows the details of a sliver funnel with scanning element, such as they are known in the state of the art.
  • the sliver funnel with scanning element is a special design of a sliver guide with scanning device.
  • the sliver funnel 80 may be located before the drafting equipment of a draw frame, for example. Several fiber slivers 87 are doubled by the sliver funnel 80 and compressed into a fiber sliver 8. In a recess in one side of the funnel, a scanning element 86 is installed. The scanning element 86 is pivotably mounted in an axle 81. The lever of the scanning element 86 which is outside of the funnel 80 is connected to a spring 82 which puts the scanning element 86 under tension. The spring 82 presses the gliding surface of the scanning element 86, which is located inside the funnel 80, against the entering fiber sliver in the direction of the fixed sliver funnel side.
  • the scanning element 86 may furthermore be connected to a plunger 84 which extends into an electric measuring element 83.
  • the electric measuring element 83 may be a plunger coil for example. Because of varying fiber sliver thickness, the scanning element 86 is moved. The movement of the scanning element 86 leads to a movement of the plunger 84, so that the electric measuring element 83 produces an electric measuring signal 85. In the case of a wider deflection of the scanning element 86, the contact pressure through the spring attains different values than is the case with shorter deflections. The disadvantage that no consistency of contact pressure exists over the entire measuring range of the scanning element 86 persists. This is the analogous fault to that which was already described with respect to the pair of scanning rollers 28, 28'.
  • FIG. 3 shows an embodiment according to the invention.
  • the adjusting element 30 can be made in the form of a hydraulic or pneumatic volume storage.
  • the volume storage consists of a cylinder chamber 32, 34 with piston 33.
  • a compression spring 35 with known spring curve is installed in the cylinder chamber 34.
  • the force of the spring 35 is directed so that the piston 33 can be moved in the direction of the cylinder chamber 32.
  • the piston 33 is connected to rod 36.
  • the other end of rod 36 is connected to a swivel arm 41.
  • the swivel arm 41 supports an axle 43 in which the rod 36 is movably mounted. At its end the rod 36 supports a target 39. Across from the target is a contact-less proximity sensor 44.
  • the swivel arm 41 supports a movable scanning roller 40'.
  • the swivel arm can swivel around the rotation axle 42.
  • the volume storage is connected by means of connection 37 to a controlled pressure generator 38 via the latter's connection circuit.
  • the volume storage's expansion is sized so that all pressure changes in the cylinder chamber 32 produced via the connection scanning roller 40'--piston 33 are damped so that the pressure in the cylinder chamber 32 can be maintained at a substantially constant value.
  • the desired contact pressure of the movable scanning roller 40' must be adjusted.
  • the force of spring 35 must be overcome.
  • compressed gas for instance, is blown in at the connection 37 by means of the pressure generator 38.
  • the connection 37 can therefore be connected directly to a central compressed-gas generator of a drafting equipment.
  • the pressure generator 38 can be adjusted, so that pressure generation is stopped when the wanted gas pressure is reached in the cylinder chamber 32.
  • the pressure existing in the cylinder chamber 32 is the value which is finally equivalent to the required contact pressure of the movable scanning roller 40'.
  • the cylinder chamber 32 which is sized as a volume storage makes it possible for movements of the piston 33 to result in an insignificant change of the pressure in the cylinder chamber 32, so that the contact pressure of the movable scanning roller 40' over its entire measuring range can be maintained essentially constant.
  • FIG. 4 shows an adjusting element 45 in a design which is somewhat different from that of FIG. 3.
  • the adjusting element 45 is provided with a cylinder chamber 47, 49 with a piston 48.
  • the piston 48 is connected, similarly to that of FIG. 3, to a rod 51, to a movable scanning roller (not further shown). The movement of the scanning roller is transmitted via rod 51 to the piston 48.
  • a compression spring 50 is located in the cylinder chamber 49 and exerts a force upon piston 48.
  • a pressure sensor S which is connected to a display device can be provided in the cylinder chamber 47.
  • the cylinder chamber 47 is connected to a pressure equalization cylinder 46.
  • the pressure equalization cylinder 46 is connected to an adjustable pressure generator 52 and to its connecting circuit.
  • the adjusting element 45 functions on the principle of the volume storage.
  • the cylinder chamber 47 is sized so that it is able to absorb all the movements of the piston 48.
  • the pressure equalization cylinder 46 represents an additional volume.
  • the pressure equalization cylinder 46 is sized so that the pressure changes produced by the piston 48 become so minimal and insignificant that the pressure prevailing in the cylinder chamber 47 remains essentially constant. This pressure is sensed by sensor S and is displayed by means of the display device A.
  • the pressure equalization cylinder 46 may be a defined length of a connection pipe, for example.
  • the pressure equalization cylinder 46 may however also be a defined length of a stretchable hose.
  • the stretchable hose has the advantage that its length can be kept shorter since its sides can stretch.
  • the adjusting element 45 can be filled with compressed gas, for example, by means of the adjustable pressure generator 52.
  • the display device A displays the current gas pressure in the adjusting element 45 to the operating personnel. Based on calculations or measurements, the pressure in the adjusting element which is needed in order to set a required contact pressure on the movable scanning roller can be ascertained. When this equivalent pressure is reached in the adjusting element 45, the pressure generator 52 is stopped. The desired pressure is maintained in the adjusting element 45.
  • FIG. 5 shows an embodiment with further changes.
  • the adjusting element 60 consists of a cylinder chamber 55, 57 with piston 56.
  • the piston 56 is connected by means of rod 59 to a movable scanning element (not shown). It could for example also be the connection to a scanning element of a sliver funnel.
  • a compression spring 58 is installed in the cylinder chamber 57, exerting a force on the piston 56.
  • the cylinder chamber 55 is connected to a pressure equalization cylinder 54.
  • the pressure equalization cylinder 54 is connected to a pressure reduction valve 53.
  • the cylinder chamber 55 and the pressure equalization cylinder 54 function on the principle of the volume storage. This volume storage is finally connected to a pressure reduction valve 53.
  • the input of the pressure reduction valve 53 is connected to an adjustable pressure generator 61 and to its connection circuit.
  • a desired value for the gas pressure in the volume storage can be set on the pressure reduction valve 53.
  • the pressure generator 61 produces the gas pressure. If the gas pressure in the adjusting element 60 becomes too great, the pressure reduction valve 53 reduces the gas pressure automatically to the set desired value. It is important for the functioning of the pressure reduction valve 53 that a required input pressure is constantly produced and ready by the pressure generator 61.
  • FIG. 6 shows a possible design of an adjusting element 70, whereby a pressure-generator 72 may not only be a stationary pressure generator, but where a mobile pressure generator could also be used.
  • the adjusting element 70 also functions on the principle of the volume storage, whereby a cylinder chamber 65,66 with piston 67 and pressure equalization cylinder 64 are provided.
  • the piston 67 is connected by means of rod 69 to a movable scanning element (not shown).
  • the cylinder chamber 66 contains a compression spring 68 which exerts a force on the piston 67.
  • the pressure equalization cylinder 64 is connected to a pressure reduction valve 63. Furthermore the input of the pressure reduction valve 63 is connected to a check valve 62.
  • the check valve 62 with its connection 71 constitutes the connection to the adjusting element 70.
  • a mobile pressure generator 72 could for example be connected to the connection 71.
  • the pressure generator 72 may be a compressed-gas generator. Compressed gas would be conveyed through the check valve 62 and the pressure reduction valve 63 into the pressure equalization cylinder 64 and into the cylinder chamber 65. In this process the piston would be moved against the spring 68. The spring 67 presses in that case by means of rod 69 against the movable scanning element.
  • the pressure generator 72 is disconnected from the connection 71 when the desired pressure has been reached in the pressure equalization cylinder 64 and in the cylinder chamber 65. This can be ascertained on the display instrument of the pressure generator 72 or by means of installing a sensor in the cylinder chamber 65 and by means of its connection to a display device.
  • the pressure set in the volume storage corresponds to the desired value set at the pressure reduction valve 63.
  • This pressure on piston 67 is an equivalent of the contact pressure which can be measured on the movable scanning element.
  • This contact pressure on the movable scanning element must remain essentially constant over the entire measuring range of the scanning element. This requirement is met in that the cylinder chamber 65 in the adjusting element 70 and in the equalization cylinder 64 operate on the principle of the volume storage.
  • the check valve 62 makes it possible for the pressure to remain constant at the input of the pressure reduction valve after cutting off the connection to the pressure generator 72. By contrast with FIG. 5, the pressure generator can be disconnected or removed.
  • FIG. 7 shows a controllable adjusting element 90 in another embodiment.
  • the adjusting element 90 comprises a cylinder chamber 75, 76 with piston 77 and a pressure equalization cylinder 74.
  • the piston 77 is connected by means of rod 79 to a scanning element.
  • the piston 77 in turn is pre-stressed by means of a spring 78 located in the cylinder chamber 76.
  • the cylinder chamber 75 is connected to the pressure equalization cylinder 74.
  • In the cylinder chamber 75 is a sensor 73 which is connected to controls 93.
  • the pressure equalization cylinder 74 is connected to a control valve 91.
  • the control valve 91 is connected to a pressure generator 92 by a connection circuit.
  • the pressure generator 92 may be a compressed-gas generator for example, and delivers compressed gas into the adjusting element 90.
  • the sensor 73 transmits the current pressure in the adjusting element 90 to the controls 93.
  • the controls 93 switches the control valve 91.
  • the desired value programmed in the controls 93 for the pressure is equal to the value which is also an equivalent of the contact pressure to be set on the movable scanning element.
  • the pressure generator 92 reaches an upper limit value of the pressure at which it stops itself while the control valve is closed.
  • the embodiment according to FIG. 7 has the advantage that when batches are changed, for example, the adjustment to a different contact pressure can be made by the controls 93.
  • the controls 93 receive instructions, through manual entry or through a command from a control program, to switch over to a different desired value of the pressure in the adjusting element 90, the controls 93 are able to do so by means of the control valve 91.
  • the control valve 91 would be switched by means of controls 93 to pass-through direction between pressure generator 92 and adjusting element 90. At the same time the pressure generator would be started up by the controls via the connecting circuit.
  • the pressure generator 92 can increase the pressure in the adjusting element 90 to the applicable desired value.
  • the sensor 73 transmits the current pressure values in the adjusting element 90 to the controls 93, the latter recognizes when the new applicable desired value is reached.
  • the control valve 91 is closed.
  • the new desired value for the pressure in the adjusting element 90 is maintained as the control valve 91 closes.
  • the pressure generator 92 switches off automatically, as described earlier.
  • the control valve can be switched by means of the program of controls 93 to an outflow position, i.e. compressed gas can escape from the adjusting element 90 via the control valve 91 to the outside into the atmosphere.
  • the controls 93 close the control valve 91 and maintains the low desired value of the pressure.
  • the control valve 91 could be made in form of a 3-way valve 100, for example.
  • FIG. 7a shows a possible embodiment of a 3-way valve 100.
  • the valve position A relates to the establishment of a connection V between the connecting circuit of the pressure generator 92 and the pipe line to the adjusting element 90, so that compressed gas can be conveyed by the pressure generator 92 into the adjusting element 90.
  • the valve position B relates to the interruption U of said connection, so that no compressed gas can escape from the adjusting element 90.
  • the valve position C relates to the establishment of a connection V between the adjusting element 90, i.e. between the pressure equalization cylinder 74 and an outflow pipe AR.
  • the outlet of the outflow pipe AR goes into the surrounding atmosphere, so that compressed gas is able to escape from the pressure equalization cylinder 74 with cylinder chamber 75 into the atmosphere. In that case the pressure in the adjusting element 90 is reduced.
  • the corresponding valve position A, B or C which is effected on the control valve 91 in the form of a 3-way valve 100 is controlled by controls 93.
  • FIG. 8 shows another embodiment of the invention.
  • the adjusting element 99 is constituted by an electrical cyclic magnet 94 which is integrated with gear 95.
  • Gear 95 is connected by means of force transmission device 96 to a scanning element.
  • the cyclic magnet 94 is connected by means of transmission circuit 98 to a controlled voltage source 97.
  • the cyclic magnet is used to supply a torque at very low rotational speed or when standing still. It is thus possible to produce a constant torque for a fixed measuring range of the scanning device, ensuring a nearly constant contact pressure of the scanning element via the force transmission device 96.
  • the rotational speed of the cyclic magnet 94 and thereby its torque can be adjusted to a desired value.
  • the direction of rotation can also be changed. This is useful when the movable scanning element is to be taken away from the fixed sliver guide and into an opening position.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Power Engineering (AREA)
  • Preliminary Treatment Of Fibers (AREA)
  • Length Measuring Devices With Unspecified Measuring Means (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Decoration Of Textiles (AREA)
  • Details Of Garments (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
US08/441,481 1995-01-05 1995-05-15 Process for pressing a scanning device against a fiber sliver in a sliver guide and device for its production Expired - Fee Related US5755135A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19500189A DE19500189B4 (de) 1995-01-05 1995-01-05 Verfahren zur Anpressung eines Tastorgans an einen Faserverband in einer Bandführung und Vorrichtung zu deren Erzeugung
DE19500189.3 1995-01-05

Publications (1)

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US5755135A true US5755135A (en) 1998-05-26

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Country Status (5)

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US (1) US5755135A (it)
JP (1) JPH08285567A (it)
CZ (1) CZ4396A3 (it)
DE (1) DE19500189B4 (it)
IT (1) IT1281588B1 (it)

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US6289599B1 (en) * 1997-09-17 2001-09-18 TRüTZSCHLER GMBH & CO. KG Apparatus for measuring the thickness of sliver bundle formed of a plurality of side-by-side running slivers
WO2006120704A1 (en) * 2005-05-06 2006-11-16 Sree Ayyanar Spinning And Weaving Mills Limited A method for drafting of sliver and apparatus thereof
CN108100434A (zh) * 2017-12-08 2018-06-01 南通市苏中纺织有限公司 一种棉纺运输及卸料装置
CN108147102A (zh) * 2017-12-08 2018-06-12 南通元创卓宇纺织品有限公司 一种棉纺运输及多样性卸料装置
US10208406B2 (en) 2015-11-02 2019-02-19 Kabushiki Kaisha Toyota Jidoshokki Method and device for cutting lap in comber
CN110509134A (zh) * 2019-09-12 2019-11-29 西安奕斯伟硅片技术有限公司 一种晶圆研磨装置
US10620001B2 (en) * 2017-04-03 2020-04-14 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Measuring device for a side impact test

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DE19721758B4 (de) * 1996-06-29 2010-12-02 TRüTZSCHLER GMBH & CO. KG Vorrichtung an einer Karde, bei der am Ausgang der Karde ein Flortrichter mit Abzugswalzen vorhanden ist
DE19950901A1 (de) 1998-11-18 2000-05-25 Truetzschler Gmbh & Co Kg Vorrichtung zum Messen der Dicke und/oder der Ungleichmäßigkeit von Faserbändern
DE19908371A1 (de) * 1999-02-26 2000-08-31 Truetzschler Gmbh & Co Kg Vorrichtung an einer Strecke zur Verarbeitung eines Faserverbandes aus Faserbändern
DE10059262A1 (de) * 2000-11-29 2002-06-13 Truetzschler Gmbh & Co Kg Verfahren zur Optimierung der Regelung und Steuerung von Verzugseinrichtungen an Spinnereimaschinen
DE102005023992A1 (de) 2005-05-20 2006-11-23 TRüTZSCHLER GMBH & CO. KG Vorrichtung an einer Spinnereivorbereitungsmaschine, z.B. Karde, Krempel, Strecke, Kämmmaschine o.dgl., zum Ermitteln der Masse und/oder Masseschwankungen eines Fasermaterials, z.B. mindestens ein Faserband, Faservlies o.dgl., aus Baumwolle, Chemiefasern o. dgl.
DE102005033180B4 (de) * 2005-07-13 2020-03-12 Trützschler GmbH & Co Kommanditgesellschaft Vorrichtung zum Erfassen eines Parameters an mehreren, einem Streckwerk einer Spinnereimaschine zugeführten Faserbändern
DE102007039067A1 (de) 2007-08-17 2009-02-19 TRüTZSCHLER GMBH & CO. KG Vorrichtung an einer Kämmmaschine zur Überwachung des Kämmlingsanteils
DE102008008210B4 (de) * 2007-12-06 2013-07-18 Sipra Patententwicklungs- Und Beteiligungsgesellschaft Mbh Verfahren und Rundstrickmaschine zur Herstellung einer Maschenware aus einem ungedrehten Fasermaterial
DE202008001797U1 (de) * 2007-12-20 2009-06-10 Sipra Patententwicklungs- Und Beteiligungsgesellschaft Mbh Maschine zur Herstellung von Maschenware unter zumindest teilweiser Anwendung von Fasermaterial
CH699284A2 (de) * 2008-07-31 2010-02-15 Rieter Ag Maschf Anpressvorrichtung für Kalanderwalzen.
DE102013110914A1 (de) * 2013-10-01 2015-04-02 Trützschler GmbH & Co Kommanditgesellschaft Wattenmaschine und Verfahren zur Herstellung einer Watte aus Faserbändern
CH716167A1 (de) * 2019-05-09 2020-11-13 Rieter Ag Maschf Abreisszylinderaggregat mit einer Vorrichtung für Druckzylinder von Abreisszylinderpaaren einer Kämmmaschine.
CN116659441A (zh) * 2023-07-28 2023-08-29 淄博美林电子有限公司 检测半导体晶片厚度的检测装置
CN118328896B (zh) * 2024-06-12 2024-08-16 四川雯创亿科技有限公司 一种航空机械尺寸测量装置及其测量方法

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6289599B1 (en) * 1997-09-17 2001-09-18 TRüTZSCHLER GMBH & CO. KG Apparatus for measuring the thickness of sliver bundle formed of a plurality of side-by-side running slivers
WO2006120704A1 (en) * 2005-05-06 2006-11-16 Sree Ayyanar Spinning And Weaving Mills Limited A method for drafting of sliver and apparatus thereof
CN101171375B (zh) * 2005-05-06 2010-06-09 丝瑞阿亚纳纺纱和编织有限公司 棉条牵伸方法及其设备
US10208406B2 (en) 2015-11-02 2019-02-19 Kabushiki Kaisha Toyota Jidoshokki Method and device for cutting lap in comber
US10620001B2 (en) * 2017-04-03 2020-04-14 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Measuring device for a side impact test
CN108100434A (zh) * 2017-12-08 2018-06-01 南通市苏中纺织有限公司 一种棉纺运输及卸料装置
CN108147102A (zh) * 2017-12-08 2018-06-12 南通元创卓宇纺织品有限公司 一种棉纺运输及多样性卸料装置
CN110509134A (zh) * 2019-09-12 2019-11-29 西安奕斯伟硅片技术有限公司 一种晶圆研磨装置
CN110509134B (zh) * 2019-09-12 2021-04-09 西安奕斯伟硅片技术有限公司 一种晶圆研磨装置

Also Published As

Publication number Publication date
CZ4396A3 (en) 1996-07-17
DE19500189B4 (de) 2006-09-14
IT1281588B1 (it) 1998-02-20
DE19500189A1 (de) 1996-07-11
ITMI960006A1 (it) 1997-07-04
JPH08285567A (ja) 1996-11-01
ITMI960006A0 (it) 1996-01-04

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